Clutch, Chain Drive, Chain Brake And Chain Tensioner; Clutch Drum; Chain Sprocket - Stihl 088 Owner's Manual

3.

CLUTCH, CHAIN DRIVE, CHAIN BRAKE AND CHAIN TENSIONER

3.1 Clutch Drum/Chain Sprocket
• Unscrew nuts.
− Remove the chain sprocket cover.
• Disengage the chain brake by
pulling the hand guard toward
the front handle.
• Remove the E-clip (1).
• Remove the washer (2).
STIHL 088
• If a rim sprocket is fitted, pull it
off.
• Pull off the clutch drum/chain
sprocket.
• Take the needle cage out of the
sprocket.
- Clean and inspect the clutch
drum/chain sprocket.
Important: If there are noticeable
wear marks on the inside diameter
of the clutch drum, check its wall
thickness. If it is less than 80% of
the original wall thickness, fit a
new clutch drum.
Note: If the clutch drum has to be
replaced, also check the brake
band - see 3.3.
• If the clutch drum is still serviceable,
use No. 120 emery paper or emery
cloth (grain size approx. 120µm) to
clean and roughen its friction
surface.
Reassemble in the reverse
sequence.
− Clean stub of crankshaft. Wash
needle cage in clean white spirit and
lubricate with grease - see 11.2.
− Replace damaged needle cage.
− Rotate clutch drum/chain sprocket
and apply slight pressure at the
same same until oil pump drive
spring engages properly.
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